/*
 * Copyright (C) Michael Opitz
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
 * USA
 */
#ifndef NOTIFIER_H
#define NOTIFIER_H

#include "listener.h"

#include <boost/shared_ptr.hpp>
#include <boost/thread/mutex.hpp>

#include <list>
using namespace std;

/** 
 * \brief This namespaces includes all nertwork related stuff.
 * \author Michael Opitz
 */
namespace network {
	/** 
	 * \brief This class represents an Observable (Observer-Pattern).
	 */
	class notifier {
	public:
		virtual ~notifier() {}

		/** 
		 * \brief add_listener adds an Observer to the Observable
		 * 
		 * \param l is the Observer which should be added.
		 */
		virtual void add_listener(
			boost::shared_ptr<network::listener> l);
		/** 
		 * \brief remove_listener removes an Observer from the
		 * Observable
		 * 
		 * \param l is the Observer which should be removed.
		 */
		virtual void remove_listener(
			boost::shared_ptr<network::listener> l);
	protected:
		/** 
		 * \brief fire_listener is called by sub-classes which want
		 * notify the Observers
		 */
		void fire_listener();
	private:
		list<boost::shared_ptr<network::listener> > _list;
		boost::mutex _mon;
	};
}

#endif
